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Financing Arrangements, Portfolio Investments - Assets Pledged as Collateral (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | $ 1,179,961 | $ 1,276,918
Fair Value of Collateral Pledged | 1,361,732 | 1,453,699
Amortized Cost of Collateral Pledged | 1,277,454 | 1,368,115
Consolidated K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
K-Series, carrying value | 506,500 | 468,000
Agency ARMs |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 65,173 | 86,349
Fair Value of Collateral Pledged | 67,923 | 90,343
Amortized Cost of Collateral Pledged | 70,385 | 92,586
Agency Fixed- Rate |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 809,744 | 842,474
Fair Value of Collateral Pledged | 856,397 | 890,359
Amortized Cost of Collateral Pledged | 892,262 | 902,744
Non-Agency RMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 9,750 | 38,160
Fair Value of Collateral Pledged | 11,885 | 51,841
Amortized Cost of Collateral Pledged | 11,751 | 50,693
CMBS |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Outstanding Financing Arrangements | 295,294 | 309,935
Fair Value of Collateral Pledged | 425,527 | 421,156
Amortized Cost of Collateral Pledged | 303,056 | 322,092
CMBS | Consolidated K-Series |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
K-Series, carrying value | $ 385,600 | $ 377,500

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- Definition Represents the aggregate carrying value of the investment in the multi-family loans held in securitization trusts. + References No definition available. + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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